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Twelfth Army Corps

6 AM 17 September to 12 PM 17 September

U.S.A.
TWELFTH ARMY CORPS
Maj. Gen. Jos. K. F. Mansfield, Commanding.

(September 17, 1862.)
   The Twelfth Corps left its bivouac on the Line and Hoffman farms at daylight, moved forward, in column of Battalions in mass, and deployed in support of the First Corps, Williams' Division on the right and Greene's Division on the left. Its line extended from D. R. Miller's house, on the Hagerstown Pike, in a southeasterly direction to and across the Smoketown Road. While the deployment was in progress, Maj. Gen. Mansfield was mortally wounded and carried from the field.

He was succeeded by Brig. Gen. A. S. Williams. This Corps supported, and then relieved, the First Corps.

Later in the day it formed in support of the First and Sixth Corps of the Army of the Potomac.

Location:   north side Mansfield Avenue near the Smoketown Road (Map 1)

Units described and/or located by this Tablet:


Twelfth (XII) Army Corps
        1st Michigan Cavalry, Company L
1st Division, XII Corps
    1st Brigade, 1st Division, XII Corps
        5th Connecticut Infantry
        10th Maine Infantry
        28th New York Infantry
        124th Pennsylvania Infantry
        125th Pennsylvania Infantry
        128th Pennsylvania Infantry
        46th Pennsylvania Infantry
    3rd Brigade, 1st Division, XII Corps
        27th Indiana Infantry
        2nd Massachusetts Infantry
        13th New Jersey Infantry
        107th New York Infantry
        Collis' (PA) Independent Company
        3rd Wisconsin Infantry
2nd Division, XII Corps
    1st Brigade, 2nd Division, XII Corps
        5th Ohio Infantry
        66th Ohio Infantry
        7th Ohio Infantry
        28th Pennsylvania Infantry
    2nd Brigade, 2nd Division, XII Corps
        3rd Maryland Infantry
        102nd New York Infantry
        111th Pennsylvania Infantry
    3rd Brigade, 2nd Division, XII Corps
        1st District of Columbia Infantry
        3rd Delaware Infantry
        Purnell Legion (Maryland) Infantry
        60th New York Infantry
        78th New York Infantry
XII Corps Artillery
        Maine Light Artillery, 4th Battery
        Maine Light Artillery, 6th Battery
        1st New York Light Artillery, Battery M
        New York Light Artillery, 10th Battery
        Pennsylvania Light Artillery, Independent Battery E
        Pennsylvania Light Artillery, Independent Battery F
        4th United States Artillery, Battery F



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